I got my BB Curve today from T-Mobile. I have the BlackBerry Unlimited E-mail Add-on service which is working well.
I would like to get even internet without having to subscribe for that again. I believe it might be possible. I tried using with wap.voicestream.com setting in APN and also on mini-opera.
Can someone please help ? ( I am not looking for internet over wi-fi ... )
Do a search and read up on the wifi section of the forum. Your question's been asked multiple times. In short, no data plan means no internet through the cell towers. You can still get internet through wifi if your phone has wifi capabilities.